Machine for sharpening disks and the like



Nov. 8, 1932. c. D. WRIGHT I 1,886,859

MACHINE FOR SHARPENING DISKS AND THE LIKE Filed Sept. 22, 1928 8 Sheets-Sheet l IQj i, Z

CINVENT% Nov. 8, 1932. c. D. WRIGHT MACHINE FOR SHARPENING DISKS AND THE LIKE Filed Sept. 22, 1928 8 Sheets-Sheet 2 E INVENTOR BY (7 477% ATTORNEYJ,

Nov. .8, 1932 c. n. WRIGHT 9 MACHINE FOR SHARPENING DISKS AND THE LIKE Filed Sept. 22, 1928 8 Sheets-Sheet 5 @J YW BY m /fi' 710M 9 M ATTORNEYJ,

Nov. 8, i932. c. D. WRIGHT 1,886,859 I MACHINE FOR SHARPENING DISKS AND THE LIKE Filed Sept. 22, 1928 8 Sheets-Sheet 4 INVENTOR Nov. 8, 1932. c. D. WRIGHT 1,886,859

MACHINE FOR SHARPENING DISKS AND THE LIKE Filed Se t. 22, 1928 8 Sheets-Sheet 5 Fug) INVENTOR.

A TTORNEYX,

Nov. 8, 1932;

c. D. WRIGHT MACHINE FORjHARPENING DISKS AND THE LIKE Filed Sept. 22, 1928 8 Sheets-Sheet 6 INVEN QR ATTORN Yf,

Nov. 8, 1932. c. n. WRIGHT MACHINE FOR SHARPENING DISKS AND THE LIKE 8 Sheets-Sheet 7 INVW 6/0? 415 BY ATTORNEYS,

Filed Sept. 22, 1928 Nov. 8, 1932. c. DJI WR IGHT 1,886,859

MACHINE FOR SHARPENING DISKS AND THE LIKE Filed Sept. 22. 1928 a Sheets-Sheet 8 [N VENTOR n: be.

iii

Patented Nov. 8, 1932 unit-re stares @FFEQE onenriron n. WR-IGI-IT,-F DAVENPORT, IOWA I MACHINE FOR SHAR-PENING DISKS AND THE LIKE Application filed September 22, 1828. Serial Ho. 307,604..

This invention. relates to a machine for grinding or sharpening cutting disks, more particularly those employed in agricultural implements, such as cultivator disks, grain drill disks, colter disks, andthe like, the object of the inventionbeing to produce a machine for this purpose in whichthe disks, either concaved or fiat, may be mounted and rotated, either singly or in gang, and acted. on by a sharpening tool, preferably in the form of a rotary grinding wheel which, while being rotated, may be presented in the proper position relative to the peripheral cutting edge of the disk or disks to grind the same in a uniform manner and effectively sharpen said edge, even though irregularities such as kinks,

nicks and the like may exist in the edge of the disk, the disk maybe eccentrically mounted, or it may be warped or sprung sideways, or the shaft or axle on which the disks are mounted may be sprung or bent, or other de fects may be present.

Incarrying out this object in accordance with. myinvention, the machinecomprises a suitable supporting frame or base, a support or holder for the d1sks,,by means of which the disks may be rotated, a disk $112111).

ening tool, in the present instance in the form of a grinding or cutting wheel mounted in an improved manner to adapt it to be set in the proper operative relation to the peripheral edge of the rotary disk, and movable from one disk to another, when the disks are supported in gang, suitable power means, and driving connections therefrom to the work and grinding wheel, being provided to as viewedin the direction of the arrows on said line I Fig. 5 is a front elevation of the carriage and parts carried thereby, as viewed in the direction of the arrow in Fig. 3;

Fig. 6 is a detail-plan view of the grinding wheel and the parts supporting the same, showing-thepositions of the wheel in acting; on concave disks;

Fig. 7 is a similar View showing the adj ustments of the wheel in acting on flat disks;

Fig. 8 is a vertical sectional elevationon the line 88 of Figs. 1, 6 and 7;

Fig. 9 is a longitudinal section on an enlarged scale through one of the disk guiding rolls. I

Referring to the drawings The machine comprises a suitable base or supporting frame 1 of rectangular form, and

made up in the present instance of lower front and rear longitudinal I-beams' 2 and 3,,transverse I-beams 4i, seated on and secured to the longitudinal beams, upper front and rear longitudinal I-beams 5 and 7, and an intermediate I-beam 6, which three last mentioned beams are supported on and fastened to the beams 4, and are held braced and properly spaced from each other by bolts 8 extending through the beams and surrounded by spacer pipe sections disposed between the beams.

The two beams 5 and 6 at the front ofv the frame give support to a head stock 9 adapted to be rotatably driven in a manner to be described in detail later on, and a tail stock 10, I

which two stocks are providedwith the usual centers between which the work to be acted on, is held, and has a rotativemotion imparted to it. The tail stock is adjustable on the supporting beams to and from the head stock by the adj ust-ing bolts shown, in order to accommodate work of different lengths.

.Mounted to travel along the front and rear beams 5 and 7 is a carriage frame, comprising two bars 12, preferably square in crosssection and extending parallel to each other transversely of said bars 5 and 7, which bars 12 have fixedly bolted to their outer ends, bracket plates 13 which extend downwardly at the outer sides of the respective beams 5 and 7. Vertically disposed rollers 14 are journalled on the inner sides of the bracket plates near their opposite ends and travel on the upper flanges of the lZ-beams 5 and 7, and horizontal rollers are ournalled on inward extensions of the bracket plates at opposite ends 0 the same, and travel along the outer sides of the webs of the respective I-beams 5 and 7, which two sets of rollers give movable support to the carriage frame on the base frame, whereby the carriage frame may be caused to traverse the base frame in a d rection longitudinally of the latter and in the direction of the axis of the work held between the head and tail stocks. The several rollers may be journalled eccentrically on their supporting axes, and thus provisionmade for adjusting and setting them in their proper relation to the flanges and webs, so as to comright angles to the axis oining the head and tail stocks; whereby the rinder may, by the movement of the carriage 16, be brought up to the work held between thehead andtail stocks, and by the movement of the carriage frame on the supporting frame, it may be caused to traverse the work, all in the manner to be described more in detail later on.

The carriage 16 is supported by rollers 16, journalled on the underside of the base of the carriage and traveling on the upper sides of the square bars 12, as best shown in Fig. l, although other means for supporting the carriage slidably on the carriage frame may be 7 adopted.

Arising-from the base of the carriage near its front, is a yoke frame 18 which is fixed to said base by bolts extending through a horizontal flange 18 on the lower end of the yoke frame and through said base. 7

The yoke frame is formed on its inner sides with opposed curved tracks 19, on which travel, rollers 20 journalled in he upper and lower ends of vertical blocks 21, by which means the two blocks are movable on the tracks about an axis situated midway between the blocks and extending in the direction of movement of the carriage 16. Midway between their ends, the blocks are formed with horizontal bearing holes, in which are rockingly mounted journal studs 99 extending outwardly in opposite directions from the ends of an open rectangular rocking frame 23 as shown in Figs. 5 and 6, whereby the frame 23 may rock relatively to the yoke frame about the axis of the ou'rnal studs 22, which axis may depart from the horizontal, more or less, according to the degree of movement of the rocking frame on the curved tracks of the yoke frame.

The rocking frame is formed withavertical central frame bar 23, on which is journalled on parallel axes extending in the plane of the frame, upper and lower disk guiding rolls 24 of adetailed form to be described later on which will adapt them to furnish a guide for the peripheral edges of the disks being ground.

Extending rearwardly from the lower edge of, the rocking frame 23,-is a horizontal extension or bracket plate 2d, the rear end of which is supported by two vertical coiled springs 25, having their upper ends seated around lugs 26 depending from the extension 0 vertical studs 27 screwed into the base of the carriage 16, by which means the rocking frame is yieldingly supported in its rocking motions on the studs 22 and in its oscillating movement-son the curved tracks of the yoke frame about the axis of the grinding wh el, the said rocking frame in these motions being given support at its underside by a vertical prop 28, extending between the rocking frame and the base of the carriage, the upper end of which prop is rounded and seated in a socket 28 in the underside of the rocking frame, and the lower end of which is similarly rounded and seated in a. socket 28 in a plate 29, seated on and bolted to a flange 1S on the yoke frame, which plate :28 can be adjusted vertically by the employment of shims or liners between it and the flange, and thus the vertical adjustment of the rocking frame relativeto the yoke frame effected. 7

The rearward extension 24 of the yoke frame is formed with horizontal parallel lower tracks or ways 30, extending transversely of the direction of movement of the carriage 16, and with similar upper tracks or ways 31 parallel to the lower ones, and between these tracks, rollers 32 on a slide 33 travel, there being a single roller at the front of the slide and two rollers at the rear, thereby securing a tripod principle of support, and insuring proper contact of the rollers with the tracks under all conditions.

The slide 33 gives support to a turn table 34: pivoted to the slide by a vertical pivot bolt 35, the adjacent faces of the slide and turn table being formed with circular ball races containing anti-friction balls to prevent undue friction and binding of the parts. The turn table is turned on its pivot bolt by an operating handle 3d extending horizontally from the side of the table, and the table is limited in its oscillating movements by two steps 36 and 37, extending upwardly from the slide 33, between which stops, a lug 38 on the turn table extends and is adapted to a l, and having their lower ends seated on" engage. TllGztWO- stops, are ;car-ried re spec.-. tivelybyplates 136 and 36 which rest oneuponathe other on the upper sideofthe slide 33 and, are held adjustablythereonby means mgrmovement of the table, or maybe ad+- justed to: and: from, each other relatively;

The turn: table is adapted to be locked fixedly Ion theslide againstoscillating movement,zby means of=a lockingbolt39 screwed in theitable and adaptedto bear on the upper. faceof the slide and thereby bind the table against .oscillating: movement. on its bolt, thepurpose of which detailedform of these-parts will: be more fully. described hereinafter.

' The movement of the slide 33 in its guides on the extension 24 is effected by means of a horizontal feed-screw 40 formed with a journal40 mounted to rotate in a bearing in a vertical lug 41' on the frontof the extension-24, said screw being held againstendwise 'movement-by collars 42 and 43 fixed to it and bearing respectively on the opposite sides of the :lug, said feed screw having fixed to its outer end a hand wheel 44 for turning it. The feed screw passes'freelythrough a hole in a lug-45extending downwardly from the undersideof the slide 33, and is screwed in twonuts 46 disposed-on opposite sides of the lug, which nuts slide-at their lower ends in a guidew-ay 47 in the extension 24, and are thus held from-turning on thefeed screw. Spiral springs 48 surround the feedscrew betweenthenuts and the lug 45, and are compressed under initial tension, so that the slide can yield relatively-t0 the feed-screw in the direction-of its feeding movement. The rotation of this feed screw in either direction, will cause the two nuts to advance or retreat, while maintaining their set relations to the two "springs, and corresponding motionswill be imparted to the slide, andthelatter will be thus set in the desired position subject at all times to the yielding pressureof'the springs, which will act with a compensating effect on the slide.

Thegrinding wheel 17 before alludedto, is

clamped to the forwardend of a horizontal shaft or arbor 49 by nuts 50 and 51 screwed on the threaded end of the shaft and bearing against-the opposite sides of the wheel, The shaft is mounted for'rotat'ion in an adjusting sleeve 52-threaded exteriorly and screwed in threaded openings in two standards 53 extendin upwardly fromthe --turn table 34, the said adjusting sleeve having-fixed to it at theif rontand rear, caps 54and 55 surround ing-the shaft, the cap 55 being furnished with a number of pins 56 for turning: it, and-thereby the threadedadjusting sleeve Thdshaf-t 49 is loosely encircled. near -its pivot frame 61 at its front.

frontendeby acollar 57situated within the forward end of'the adjusting sleeve and is .held engaged with the cap 54 bya sleeve 57 pinned to the shaft in rear of thecollarr Aw.

second collar 58 loosely encircles-the shaft; within the adjusting sleeve at its'rear end and affords a support for the shaft at this point. The shaft extends, at its rear end some dis-' 'tance beyond the rear end of the adjusting P sleeve, and has splined to it a driving pulley 59 mounted in abearing in the lower end of i a bracket arm 60 extending downwardly from therearend of a frame 61 extending upward- 1y from the standards53. By this means the shaft is rotated to impart rotary motion to the grindingwheel, which latter, by the ad}:

justment of the sleeve '52, may be moved in the. direction of its axis in order to present 1. j the wheel .1n lts proper relation to'the work a:

to be ground.

The pulley 59 is driven by a belt- .62 passing around a pulley63 on the rear end of a hori- Zontalmotor shaft 64 mounted 1n bearlngs 65 r 1 on the frame 61, and connected at its frontv with an electric motor 66 sustained by'the The motor receives its operating current from an electric generator 67, which is driven in the present. instance by a main motor in the form of a gasoline engine68 suitably sustained at theend:

of the supporting frame 1. V

The shaftof the gas engine has fixed'to its end, apulley 69 around which passes a driving belt 70, which drives a pulley 71 on the generator shaft, whereby the generator is. driven by the gas engine. 7

The gas engine also drives the head stock 9, bymeans of a belt'z'Q passing around a pul-.

1 ley73 on the engine shaft and adapted by the belt shifter? 4 to be shifted on fast andloose pulleys 7 5 and 7 6 mounted on a shaft 77 journalled in bearings on the supporting base.

frame of the machine at one side of the same. The shaft 7 7 has a pinion 7 8 fix-ed to itsend,

which pinion meshes with a larger pinion 79 1 on avshaft 80 mounted ln'bearmgs 1n the supporting frame at a point above and inward of the shaft 77. The shaft 80 carries" a sprocket; wheel 81, which is connected by a sprocket chain 82 to a sprocket. wheel 83 on the end of the shaft 84 caimying the head-stock 9, by which connections said head stock is .1

rotated.

The 'workto be ground is, as before stated,

mounted in the machine between the head iii gang of disks, and the disks may be either of flatform, such as colter disks, or of dished or concave form, such as are employed in I disk'cultivatorsand the like, and in accordance with the present invention, while a gang of disks may be held-for'rotation between the head and tailwstooks by mounting the shaft For instance, in operating on a colter or other disk as a single unit, such as shown in -F;1g. 7 the disk is held 111 a. disk holder '85 comprising two conical members or castings 85 which are screwed on the ends of a threaded rod 86, extending through the center ofthe disk, whereby the adjacent edges of the conical members will be clamped against the opposite sides of the disk, and the latter will be held in fixed relation to the holder; and a cone shaped block 86 is screwed on the rod and its smaller end entered in the central hole of the disk structure, thereby centering the disk between the parts of the holder. The ends of the holder are formed with center sockets to receive the centers of the head and tail stocks; and the tail stock 10 is adjusted along the frame towards the head stock and set at the proper point to support theholder between the two stocks. The disk holder is provided at opposite ends with driving dogs 88, one of which, when the holder is centered between the head and tail stocks, will extend in one of the notches in the face plate of the head stock and the holder will in thisway be rotated by the head stock. The provision of a driving dog at .each endof the disk holder, enables the holder when the grinding of the cutting edge on one side has been completedflco be reversed end for end between the head and tail stocks and be rotated in its reversed position, the driving dog which before was inactive, being in the reversed position of the parts, engaged with the face plate of the headstock.

With the disks held between the head and tail stocks and rotated as described, the

grinding wheel is in the manner to be described later on in detail, presented to the peripheral edge of the disk to grind down and sharpen the same on one side, and the disk or disks are then reversed, and the other side ground and the sharpening operation thus completed. In this operation, the peripheral edge of the disk which is being ground will engage and be guided by the disk guiding rolls 2 1, at circuinferentially spaced points on opposite sides of the point where the grinding wheel is acting, whereby the disk will be held and guided in such manner that the grinding wheel will be enabled to function with the maximum efiiciency.

The two rolls 24 are adapted to guide both flat andvdished disks, and as these rolls are identical in form and construction, a detailed description of onewill suffice.

On reference to Fig. 9, it will be seen that i the roll comprises an axle 90,.fasten'ed to and projecting from the side of the central bar 23 of the rocking frame 23, before referred to, and having two'ball race cones 91, andan outer cup or shell 92 rotatable about the axle,

and anti-frictionally supported therefrom by balls 93 arranged between the cones and shell. The shell 92 is in two parts, an inner part 9 1 containing a straight narrow periph- 'eral circumferential recess 95, in which the edge of flat disks is guided, and containing also a wide peripheral circumferential recess or groove96; and an outer part 97 which" is detachably-connected with the inner part by fastening pins 98, and which overhangs the groove 96, as at 97*, andpresents a flat circumferential surface 98 extending outward r ly from the overhanging P01171011. This flat.

surface 98 in "cooperation with the wide open recess 96, adapts the roller forguiding the edge of'conca've'disks, which edge is re ceived by the roller as shown in Fig. 6, where it will be seen that the straight side of the disk bears flatly against the surface98 andthe curved side is received in the recess 96. From this it will be, understood that, due to the clearance which exists in the recess 96 around the edge of the disk, there is no danger of the contact of any part of'the guiding roll with the side of the peripheral edge of the diskbeing ground, and consequently, there is no liability of the sharpened edge being dulled by the guiding action of the roll. By making the part ofthe shell containing the flat sur- I face 98 detachable, it may be renewed, when, by contact with the disk, it becomes so worn as to impair its efficiency in afiording a proper guide for the edge of the disk. V

The carriage 16 is movable on the carriage frame from a rearward position,in which the disk guiding rolls 24 are free of the work, to a forward position to engage the rolls with the work, and this in order that the work may be set in place between the head and tail I V stocks without interference withthe rolls;

and when the carriage is at its forward position, with the guiding rolls engaged: with the work, the carriage will be held in such posit1on under spring tension.

To effect this ob 'ect, the base of the carriage is formed as shown in Fig. 4, with a horizontal socket 100, in which 1S seated a spiral spring 101,.whose front end bears against the front wall of the socket, .and

whose rear end bears against a washer 103 slida-ble in the socket and formed with a central rearwardly extending'stud 104.. A

spacer sleeve 105 is seated at its. front end rcmovably on the stud 104, and at its rear end it is seated removably on a stud 106 on the front, end of. a screw bolt 107 screwed through a lug 108 extending upwardly from v v the rear bracket plate 13 on the carriage frame 11,the outer end of which screw bolt,

is provided with a handle 109'for turning it.

In setting the carriage in operativerelag: at

'tion tothe work,:a length of spacer sleeve 105 :is employedwhich will, when inserted be tween theiserew and spring, hold the carriage atsuch :point: on the carriage that the guiding rolls24 will engage the edge of the disk, it be erved that this position of the carriage will be determined by the diameter of the disk or disks to be ground, 2111i that different lengths of spacer sleeves will be employed with difi'erent diameters of work.

After the sharpening operation is, completed, thecarriage must be rctractedto disengage the guiding roll from their permit a new disk to be if disks are being ground individualnunits' or, to permit the carriage to-be moved later-all" for the next disk if the disks are being i in gang. This retraction of the c effected removing the p drawing the released carriage beck tracks, the carriage being set in position by first moving it back anl engaging'tthe guiding rolls with the work, and then reinserting the. spacer sleeve between the spring and feedscrew. it will be understood that in the adjustment and setting of the carriage as above described, the length ofthe spacer sleeve and the adjustment of the feed screw will be such that when the guiding rolls are engaged with the Work, the can riage will be heldby the spacer sleeve with spring-101 compressed and tension, so that the guiding rolls will be held yieldingly engaged with the work. 1 From the construction and arrangement of the parts employed in the mounting of the grinding wheel and associated parts, it will be'seen that, aside from the rotating movement of the wheel, it is capable of movements in various relatively different directionswhile subject to the driving mctionap pliedto rotate it. F or instance, the wheel is capable of the following different motions; r

-First:The wheel is movable horizontally,' togetlier With. the disk guiding rolls, in the direction of the axis of the head and tail stocks to cause the wheel to traverse the work, which movement results from the travel of the carriage frame 11 onthe base frame of the machine. W

Second :The wheel is movable horizontally, together with the'disk'guiding rolls, and with the carriage 16 to and from the work in a direction at right angles to the first movement, so as'toengage and disengage the disk guiding rolls with the work, which second movement results from the travel of the carriage 16 on the carriage frame including the bars 12. i

Third :-'lhe wheel is movable horizontally relatively to the carriage l6 and relatively to the disk guiding rolls, in a direction at rightangles toithe movement of said carriage, and in relation to the same, which spacer s movement is brought about by the travel of the slide33 in itsguides on theextension of the rocking frame. 1 v Fourth :'lh e wheel is movable relatively to the carriage 16 and to the disk guiding rolls, horizo Llly to andjfrom the rocking frame, 23 and in thedirection of movement of the carriage 16, which iselfected by the horizontal"adjustment of the threaded sleeve 52. e. Fifthz-The wheel is swingable horizontally in relation to the rocking frame 23 and the disk. guiding rolls,-about a vertical axis, which motion 'resultsfrom the oscillating movement of the turn table 53' on the slide 33, 'SiXth:-The wheel is rockable vertically with the rocking frame 28 and with the disk guiding rolls, about a horizontal axis extend ing transversely f the axis of the Wheel and coincident with the axes of the journal studs 22 of the rocking frame, which movement results from the' rocking of the rocking frame inthe yoke frame 18 on the vertical curved guides thereof. Certain of these movements are subjected to spring action, or in other words are yielding movements,'such as, the second movement as controlled by spring 101, the third movement as controlled by the conipensati -g sprin 's d8, and the sixth move-' 2-3 ment as controlled by the vertical springs 25. 1

Due to these various relative movements of the parts and the action of the springs thereon, the disk guiding rolls on the rocking frame 23 wi l engage the edge of the rotary disk with yielding pressure, and will therefore, hold to and follow'said edge and thereby efiectively support and guide the same during the grinding action, so that the grinding wheel will act with the greatest efficiency in performing its grindingopera tion, and this without regard to 1rregular1-" ties which may exist in the edge of the disks, the eccentric'mounting of the disks, the Warped condition of the disks, or toother imperfections. And the grinding wheel Will be likewise yieldingly pressed to its work, and will faithfully follow the surface being acted on without regard, to irregularities therein, and the edge ofthe disk willbe sharpened evenly uniformly.

Also, the grinding wheel may be adjusted latively to the. work and presented to the me at't'he proper angles to action the edge '0 be sharpened, either the straight side of flat disk, orthe curved side of a concave cisk. And further, the guiding rolls may be readily en aged with disengaged from the work, and the grinding wheel readily changed from one disk to another on the comoperation of the pletion of the sharpenin individual disks in the gang.

In the use of the machine for sharpening concave'disks, either a single disk may be mounted in the machine, or a of disks,

as before stated. In the case of a single disk, it is mounted in the two-part disk holder 85 shown in Fig. 7, and the holder is centered between the head and tail stocks, and the driving dog 88 at that end of the holder nearest the head stock, is engaged in one of the notches 9 in the face plate of the head stock,

' so that the rotating movement of the latter will be imparted to the work holder and the disk held therein. Or, if a gang of such disks are to be operated on, the axle carrying the gang is similarly mounted between the head and tail stocks, and a suitable driving dog is clamped to the axle and engaged with the face plate of the head stock.

The carriage 16 is now rolledup to engage the disk guiding rolls with the edge of the disk, a spacing sleeve 105 of appropriate length, as determined by the diameter of the disk, is set in place between the spring 101 and the screw 107, and the latter is screwed up to compress and apply tension to the spring and thereby hold the guiding rolls with yielding pressure against the edge of the disk.

The grinding wheel is now by the adjustment of the slide 33, turn table 3 1, and threaded sleeve 52, brought to idling position A,

' and the handle 34 on the turn table is pushed to the right to cause the lug 38 on the turn table to bring up against the stop 37. The work is now rotated by its driving mechanism, and the grinding wheel brought up to full speed, and the hand wheel 44 is turned to retract the carriage and bring the grinding wheel to position B in grinding contact with the curved side of the disk near its peripheral edge, the handle 34? being still held to the right with the lug 38 abutting against stop 37 As the grinding operation proceeds, the parts are adjusted to advance the grinding wheel along the curved surface of the disk towards its peripheral edge, until the wheel reaches position C. When this position is reached, the parts are adjusted to momentarily disengage the wheel from the work and the wheel is then adjusted to position D at the proper angle to act on the flat cutting edge X at the peripheral extremity of the disk, this final adjustment of the wheel being effected by swinging the handle 34 to the left until the lug 38 brings up against stop 36. In this position of the parts in effecting the final cut, the turn table is locket to its carrying slide by the locking bolt 39, thereby bringing into action the compensating springs 48, which will compensate for any slight variations in the periphery of the disk which the guiding rolls may not take care of.

It will be understood that in obtaining the several positions of the grinding wheel relative to the disk as above described, the threaded sleeve 52 will be screwed up to maintain the wheel in proper relation to the Work; and

further, it will be understood that the stop 37 governs the depth of the cut down the curved side of the disk, and that the stop 36 governs the angle of the finishing cut on the peripheral extremity of the disk.

When the final cut, with the wheel in position D is completed, the screw 107 is backed out to releasethe spacer sleeve 10 5 and the latter is removed, whereupon the carriage 16is retracted, so as to disengage the guiding rolls and grinding wheel from the disk, in order to permit another disk to be set in place for operation, or where a gang of disks is operated on, to permit the carriage frame 11 to be moved to the next disk, whereupon the foregoing operations are repeated.

In grinding straight or flat disks, such as colter disks, while the procedure with ref- 7 erence to the mounting of the disk and the engagement therewith of the disk guiding rolls is the same as just described in connection with concave disks, the setting of the grinding wheel relative to the work is slightly different.

As shown in Fig. 7, the grinding wheel is adjusted to four different positions; first, an idling position A, with the wheel disengaged from the work, but at an angle corresponding to that which the peripheral extremity of the disk is to be ground; second, a position B, in grinding contact with the disk and at the same angle as in its former position, the lug 38 in this position of the wheel being held engaged with the stop 36; third, a position C, in which the angle of the grinding wheel is changed, so that its plane will be nearly perpendicular to the plane of the disk, this change of angle being effected by swinging the handle 34" to the right to engage lug 38 with stop 37 and fourth, a position D, in which the grinding wheel, when the grinding operation in position C is completed, is moved back to disengage the work.

When under these various adjustments of the grinding wheel, the grinding of the'peripheral edge of the disk at one side is finished, the carriage 16 carrying the disk guiding rolls, is retracted as before explained, in order to disengage the rolls from the disk, whereupon the disk holder is reversed in its position between the head and tail stocks, and the dog 88 which had before been idle, is engaged with the face plate of the head stock, and the carriage 16 is again rolled up to the work and the grinding wheel adjusted successively to the different positions described' From the foregoing description, it will be understood that if the shaft or axle on which the gang of disks is mounted is sprung or bent, or if the disks are mounted eccentrically, or have large nicks or breaks in their periphery, these conditions will be taken care of by the motion of the carriage 16 to and from the work, and by the motion of the rocking frame 23 and the parts connected therewith about the axes of the ournal studs 22. If the disks are warped or sprungside,

wise, or were are kinks in their periphei",

these conditions will be takencare of by are, rocking motion of the frame .13 carrying the" disk guiding rolls, in the yoke frame about the axis of the grinding wheel, and by the motion of the carriage frame and partscan ried thereby, in the direction of the axis of '1 the head and tail stocks; and ifthe cutting edge of the disks is bent or turned over, the disk guiding :olls will roll out the 1rregu= carriage in combination.

In the foregoing description and accom panying drawings, 1 have set forth my inven; V said guiding devices.

tion in the particular detailed form and construction of the parts which I prefer to adopt, and which in practice have been found to answer to a satisfa tory degree the ends to be attained. It will be understood however that these details may be variously changed and modified by the skilled mechanic without departing from the limits of the invention; and further, it will be understood that the inven tion is not limited to any particular form or construction of the parts, except insofar as such limitations are specified in the claims.

In order to handle the work in mounting the same between the centers of the head and tail stocks, crane 110 is provided, as shown in Figs. 1 and 2, which is mounted to Swing on a vertical axis in bearing blocks 111 fixed to the upper and lower longitudinal beams 5 and 2. This crane will be furnished with asuitable tackle not shown, and may be swung out from the frame and hitched to the work, and then swung in to mountthe work between centers.

Having thus described my inventiomwhat I claim is 1. In a disk sharpener, the combination of a supporting frame, means thereon for rotatably supporting the disk to be sharpened, a carriage movable on the frame to and from the disk, a frame mounted on the carriage to rock about an axis parallel with the axis of he disk, and also about an axis extending transversely of the axis of the disk, disk guiding devices mounted on said rocking frame and adapted to engage the peripheral edge of the disk at circumferentially separated points, and a disk sharpening tool carried by the carriage and adapted to act on the edge of the disk between said guiding devices.

2. In a disk sharpener, the combination of a supporting frame, means thereon for rotate ably supporting the disk to be sharpened, a

carriage movable horizontally on said frame to and from the disk, yoke frame fixed on the carriage, a frame rockablein said yoke frame about a horizontal axis, disk guiding devices on the rockable frame adapted to engage theperipheral edge of thefdisk at points spaced circumferentially. from'..-each other, and a disk shari ening tool mounted onthe carriage and rada-pted' to act on the edge of the'disk, between said'guiding devices.

' 3. rm disk sharpener, the combination'of a supporting frame, means thereon for'rotatablysupportingthe disk to. be sharpened, a car iage movablehorlzontally on said frame to'a d from. the disk, a yoke frame. fixed on the carriage, a frame rockable 1nv SZLlCl' yoke frame on twozhorizontal axes atright angles to each other, disk guiding devices'ron said rockable frame adapted to engage thepe= ripheral edge of the disk at points separated circumferentially from each other, and a disk sharpening tool mounted. on the carriage and adapted to act on the edge of the disk between l. in a disksharpener, the combination of a supporting frame, means thereon for rotatably. supporting the disk to besharpened, a

carriage movable on the supporting frame to and from th'edisk, a yoke frame fixed on the carriage, a frame rockab-le in the yoke frame about two horizontal axes at right angles to each other, disk guiding devices on the rockable frame adapted to engage the peripheral edge of the disk at circumferentially spacedpoints, and a grinding wheel rotatably mounted on the carriage and adjustable relatively to the rockable frame in the direction of the axis of rotation of the Wheel.

5. In a disk sharpener, the combination of a supporting frame, means thereon for rotatably supporting the disk to be sharpened, a carriage movable on the supporting frame to and from the disk, a yoke frame fixed on the carria e, a frame rockable in the yoke frame about a horizontal axis, a vertical prop rookably supported by the carriage and giving support to the underside of the rockable frame, disk guiding devices on the rockable frame to engage the peripheral edge of the. disk at circumferentially spaced points, and a disk sharpening tool mounted on the carriage and adapted to engage the edge of the disk between the guiding devices.

6. In a disk sharpener, the combination of a supporting frame, means thereon for rotatably supporting the disk to be sharpened, carriage movable on the supporting frame to and from the disk, a frame rockable on the carriage about a horizontal axis and movable; horizontally relatively to the carriage in the direction of the axis of the disk, disk guiding devices on the rockable frame to engage the disk at circumferentially spaced points, a spring acting on the carriage to urge it to ward the work, a spring acting on the rockable frame to restrain its rocking movements frame to restrain its movements in the dime tion of the disk axis, and a disk sharpening tool mounted on the carriage and adapted to act on the edge of the disk between the guiding devices.

7. In a disk sharpener, the combination of a supporting frame, means thereon for rotatably supporting the disk to be sharpened, a slide movable on the supporting frame, a turn table rotatable on the slide, a sharpening tool on the turn table adapted by the turning movements of the table to be adjusted in proper operative relation to act on the edge of p the disk, and means for limiting the turning movement of the turn table on the slide, said means comprising two plates, one resting upon the other and fastened to the slide and adjustable as a unit in the direction of the turning movement of the table, and also adjustable relatively to each other in a like direction, and provided respectively With stops, and a lug on the turn table extending 7 between said stops.

In testimony whereof, l have aflixed my signature hereto.

CHARLTON n. WRIGHT. 

